I thought yours was a better resource, and therefore mine was redundant. I was going to initially format a table here on the forum but, decided against that

Well the more resources, the better. (Not sure if the grammar is correct here). In my link I found other similarities too not only the well known RU/BG Cyrillic. There are letters like S J Y etc. I didn't knew were Cyrillic from Ukrainian, Belarusian, Serbian etc. Hope I can make a list as soon as I get to a pc.